English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We present an unbiased method for evaluating the ranges of ages andmetallicities which are allowed by the photometric properties of the stellarpopulations that dominate the light of early-type galaxies in clusters. Themethod is based on the analysis of morphologically-classified early-typegalaxies in 17 clusters at redshifts 0.3<z<0.9 and in the nearby Coma clusterusing recent stellar population synthesis models that span a wide range ofmetallicities. We confirm that metallicity effects must play a role in theorigin of the slope of the color-magnitude relation for cluster early-typegalaxies. We show, however, that the small scatter of the color-magnituderelation out to redshifts z=1 does not formally imply a common epoch of majorstar formation for all early-type galaxies. Instead, it requires that galaxiesassembling more recently be on average more metal-rich than older galaxies ofsimilar luminosity. Regardless of the true ages and metallicities of early-typegalaxies within the allowed range, their photometric properties and the impliedstrengths of several commonly used spectral indices are found to be consistentwith apparently passive evolution of the stellar populations. Also, the implieddependence of the mass-to-light ratio on galaxy luminosity is consistent withthe observed trend. The results of our unbiased analysis define the boundariesin age and metallicity that must be satisfied by theoretical studies aimed atexplaining the formation and evolution of early-type galaxies in clusters.Comment: 25 pages, AASLaTeX, w/8 embedded PS figures, accepted by Ap

Address

About

Learn

Download the Zendy App

Discover

Explore